I work out on top of my short bike commute, too, and I still think riding my bike is one of the most significant life changes I've ever made.
It has made me a better driver, helping me become more aware of my surroundings and more cautious regarding intersections, speed (especially in residential areas), etc.
It has shifted my mindset regarding necessary trips for shopping, groceries, and everything else. I make more efficient use of my time by taking care of multiple errands in one trip, and I buy less stuff since I'm constantly thinking about how I'm going to get everything home in the trailer and/or my panniers/backpack. This makes a net financial impact as well as helping me reduce waste by buying less needless shit.
It has allowed me to get to know people in my neighborhood and city. It's a conversation starter, and since I'm in open air I can actually talk to other people. Coworkers ask questions about it, and I can talk to them about taking better care of the planet and their community, plus saving money, etc. Store clerks ask about the bike trailer, especially at the grocery store, and it helps create awareness of cyclists and pedestrians in my little part of the world.
It's fun. I enjoy working out, but this is fun in a different way, like it was when I was a kid. It helps me keep my focus on the fact that this lifestyle is about finding joy in simplicity. I have been inspired to try out some other childhood activities that are both challenging and fun - monkey bars, for instance - and as a result have a more well-rounded fitness regiment.
So IMO still worth it.